Preparation

Peel sweet potato and cut into 36 cubes (each about 3/4 inch). In a large saucepan of boiling salted water simmer potato about 4 minutes, or until just tender. In a colander drain potato and rinse under cold water to stop cooking. Cut scallions into thirty-six 1/2-inch-long pieces.

Preheat broiler.

In a bowl stir together spices and salt. Drain lamb in a colander and pat dry. Add lamb to spices and toss to coat. On each skewer thread, close together and near pointed end of skewer, 1 piece sweet potato, 1 piece lamb, and 1 piece scallion. Arrange kebabs on rack of a broiler pan in 2 rows, covering blunt ends of skewers in each row with a long strip of foil. Broil kebabs about 4 inches from heat, without turning, about 4 minutes, or until lamb is medium-rare.

Each kebab has about 19 calories and 0.4 gram fat (about 19% of calories from fat).